And have to be exchanged with the player's preference of queen, rook, bishop, or knight of the identical color. Generally, the pawn is picked to generally be promoted to the queen, but in some cases, An additional piece is preferred; this is referred to as underpromotion. From the animated diagram, https://gregoryyqgww.blogscribble.com/27033161/the-smart-trick-of-chess-that-no-one-is-discussing